In RSpec, using let variable inside before :all block

I had the same problem, I have solved it by declaring all my variables as attributes inside the before block:

describe 'index'

 before(:all) do
   @company = FactoryGirl.create(:company)
   @user = FactoryGirl.create(:user, company: @company)

   sign_in @user
   visit products_path
 end
...
end

Now you can use @user and @company inside your tests, and you shouldn’t have any warnings.